Moving Charges and Magnetism
Uttar Pradesh Board · Class 12 · Physics
Complete topic list for Moving Charges and Magnetism in Uttar Pradesh Board Class 12 Physics. Key concepts, sub-topics, and what to focus on for board exams.
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Magnetic Force and Lorentz Force
- Magnetic force acts only on moving charges, not on stationary charges
- Magnetic force is always perpendicular to both velocity and magnetic field
- Magnetic force does no work as it's perpendicular to motion
Motion of Charged Particles in Magnetic Field
- Circular motion when v ⊥ B with constant speed
- Helical motion when v has components both ∥ and ⊥ to B
- Radius of circular path is directly proportional to momentum
Magnetic Force on Current-Carrying Conductors
- Force on current-carrying wire is sum of forces on individual moving charges
- Force is perpendicular to both current direction and magnetic field
- No force when current is parallel to magnetic field
Biot-Savart Law
- Gives magnetic field due to a current element
- Field is proportional to current and inversely proportional to r²
- Field direction is perpendicular to both current element and position vector
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